BMI Calculator
Calculate your Body Mass Index and check your health status
BMI Calculator
Calculate your Body Mass Index and check your health status
Select your preferred measurement unit system. Metric (cm, kg) is the standard in Korea, Europe, and most of Asia, while Imperial (inches, lbs) is primarily used in the United States. The system selection automatically adjusts input fields and results to the corresponding units, ensuring convenient and accurate measurements.
Enter your height. If you selected metric, enter in centimeters (e.g., 170cm); if imperial, enter in inches (e.g., 67 inches). Accurate height measurement is crucial for precise BMI calculation, so use a recent measurement whenever possible.
Enter your weight. For metric, enter in kilograms (e.g., 65kg); for imperial, enter in pounds (e.g., 143 lbs). For the most accurate results, it's recommended to use weight measured in the morning before eating.
Click the 'Calculate BMI' button to instantly receive your body mass index analysis. The calculator uses the standard BMI formula (BMI = weight(kg) / height(m)²) to calculate your precise BMI value and automatically classifies your health category according to WHO standards.
Review your BMI value prominently displayed in the results section. The number is shown on a color-coded card providing immediate visual feedback with blue (underweight), green (normal), yellow (overweight), orange/red (obesity). The BMI scale is visualized with an interactive gauge showing your position across the entire range.
Read the detailed description and personalized health advice for your BMI category in the health status section. Each category provides practical next steps including dietary improvements, exercise recommendations, and when medical consultation is necessary.
Check the ideal weight range information to see the recommended weight range for achieving a normal BMI (18.5-24.9). The tool automatically calculates the weight you need to lose or gain, helping you set realistic weight management goals.
Reference the BMI classification chart to understand the exact numerical ranges for all categories (underweight <18.5, normal 18.5-24.9, overweight 25-29.9, obesity class I 30-34.9, obesity class II 35-39.9, obesity class III ≥40) and track your progress over time.
Pro Tips
- For the most consistent results, measure your weight at the same time each day, preferably in the morning after using the bathroom and before eating. Weight can fluctuate by 1-2kg throughout the day, so consistent measurement timing is important for accurate tracking.
- While BMI is a useful screening tool, it doesn't distinguish between muscle mass, bone density, and body fat distribution. Athletes or very muscular individuals may have a high BMI despite low body fat, so consider BMI alongside other health indicators like waist circumference and body fat percentage.
- When setting weight management goals, aim for gradual and sustainable weight loss of 0.5-1kg per week. Rapid weight changes can be harmful to health and increase the risk of yo-yo effects. Use the BMI calculator to track progress monthly.
- Calculate your BMI before doctor visits to make health checkups more productive. Bringing your BMI value along with ideal weight range information allows for more specific conversations with healthcare professionals about weight management, nutrition, and exercise plans.
- If you're pregnant, under 18, over 65, or have serious health conditions, consult with healthcare professionals before interpreting BMI results. These groups may have special BMI considerations or alternative health indicators may be more appropriate.
- Keep a weight management journal. Regularly calculate your BMI (monthly) and record the results in a notebook to visualize progress over time. This helps maintain motivation and adjust dietary habits or exercise routines as needed.
- Combine BMI with other health indicators. Monitoring waist circumference (recommended <90cm for men, <85cm for women), blood pressure, blood sugar levels, and cholesterol levels together provides a more complete picture of overall health status.
Why Use This Tool?
The BMI Calculator provides comprehensive weight assessment capabilities that combine scientific accuracy with practical health guidance to support both personal health management and professional medical evaluation. Immediate Health Risk Recognition clearly classifies weight categories (underweight, normal, overweight, obesity classes I-III) according to WHO standardized criteria, enabling users to understand their current health status and recognize weight-related health risks early to take preventive measures. Personalized Health Advice offers specific and actionable recommendations for each BMI category, guiding dietary improvements, increased exercise, and when to seek medical consultation, providing guidance tailored to individual needs beyond general advice. Weight Management Goal Setting calculates ideal weight ranges and exact kilograms needed to lose or gain, helping set realistic and achievable goals, with progress tracking over time maintaining motivation and enabling success measurement. Medical Consultation Preparation provides accurate BMI information before doctor visits enabling more productive conversations, offering objective data that helps healthcare professionals provide customized treatment plans, nutrition recommendations, and health risk assessments. Multi-Unit System Support seamlessly supports both metric (cm, kg) and imperial (inches, lbs) systems, allowing users worldwide to use familiar measurement units and enabling international travelers or immigrants to switch easily between systems. Visual Health Feedback provides color-coded results and interactive BMI scales, transforming numerical data into intuitive visual representations and enabling immediate understanding of position across the entire BMI range, making complex health information accessible. Chronic Disease Management Support helps patients with diabetes, cardiovascular disease, and hypertension monitor weight as part of their treatment plan, visualizing how weight loss relates to health indicator improvements (blood sugar control, blood pressure reduction) and reinforcing motivation for healthy lifestyle changes. Insurance and Health Assessment Preparation provides accurate BMI information needed for life insurance, health insurance, and workplace health screenings, streamlining the application process, and as normal BMI often leads to more favorable premiums or health ratings, provides financial incentive for maintaining healthy weight. Education and Health Awareness teaches students, adolescents, and adults about healthy weight ranges, the importance of nutrition, and the value of regular exercise, promoting health literacy and preventive healthcare in school, workplace, and community settings while establishing foundations for lifelong healthy habits. User-Friendly Accessibility presents complex medical calculations in a simple and intuitive interface, making professional health assessment tools accessible to people of all ages and technical levels, freely available anytime anywhere ensuring democratic access to health information while encouraging regular self-monitoring and proactive health management.